It is illegal to step out of an airplane while it is in flight.

The Law

Although it defies all logic and self-preservation, lawmakers felt the need to explicitly forbid exiting a plane mid-air unless it is an emergency or part of a sanctioned parachute jump. The rule was drafted during the early days of aviation to prevent daredevils and stuntmen from endangering people on the ground. Today, it stands as a hilarious reminder that some laws only exist because someone, somewhere, actually tried it.